Treasury bills explained: how it actually works

Treasury bills come up constantly in conversations about Nigerian investing, usually described as safe, short-term, and reliable. All of that is true, but it is worth actually understanding the mechanics rather than just repeating the reputation.

What you are actually buying

A treasury bill is a short-term debt instrument issued by the government. When you buy one, you are lending money to the government for a fixed period, commonly ranging from a few weeks up to a year. In exchange, the government agrees to pay you back a set amount at the end of that term.

The way the return works is a little different from a regular loan. You typically pay less than the final repayment amount upfront. The difference between what you pay now and what you receive at maturity is your return. So if a bill has a face value of a certain amount at maturity, you might pay somewhat less than that today to acquire it, and collect the full amount later.

Why it is considered low risk

The government is generally seen as the most reliable borrower in its own currency, because it can raise funds through taxation and other means to meet its obligations. That does not mean zero risk exists, but relative to most other instruments available, a treasury bill sits near the safer end of the spectrum. This is why it is often used as a benchmark that other short-term rates get compared against.

What determines the return

The rate you receive is not fixed forever. It is set at the time the bill is issued, based on current market conditions, including inflation expectations and how much the government needs to borrow at that moment. This is why the rate on a treasury bill you buy today can be different from the rate on one issued a few months from now. Once you have bought a bill at a given rate, though, that rate is locked in for your term. It will not change while you are holding it.

What happens at maturity

At the end of the term, you receive the full face value back. There is no ongoing decision to make during the term itself, no dividends to track, no price to watch day to day. It is a defined start, a defined end, and a defined amount you receive at that end, which is a large part of why it is considered a simple, predictable instrument to hold.

Understanding this mechanic is useful even if you never buy one directly, because so many other short-term financial products, including fixed deposits and money market funds, are priced with reference to the treasury bill rate.